I now have two of these, and they are both used weekly.
I make a 74% or higher French-bread dough, using an overnight poolish pre-ferment, and with the help of these baguette trays always turn out authentic classic French Bread Baguettes.
A few hints I've learnt:
Don't wash them after use; let cool and just with your hand scrape off any residue of the dough baked on, after a few uses you will then get even less sticking to them.
Don't over-load with dough, shape to the size before putting in the tray, and leave a little bit of space at each end before they undergo the final rise in the trays.
Cook hot, as hot as the oven will go, for at least the first 15 minutes, and during this time create steam within the oven (old roasting tray full of water in bottom of oven etc), to ensure a good oven-spring and crust texture (remove steam after 15 minutes though for full crust development).
Score each baguette using a lame (or suitable sharp knife), to get the typical Baguette appearance, this also helps in the oven spring of the baguettes (Score at end of final rise in trays, having first sprayed baguettes with water, and wet blade of knife during scoring, score quickly, and firmly to avoid snagging on the dough).
Add a small amount of rye flour (8% or less), to the dough, if you want a vaguette which keeps fresh slightly longer.
Once cooked, and cooled down, you can make garlic bread with the baguettes; cut baguettes appropiately, put in garlic butter, put in the trays, cover with tin foil, cook 15 - 20 minutes, then remove foil to allow to toast/chrisp up crust.
These baguette trays are excellent and at a decent price too, I expect they shall give years and years of regular use without failing.
As others have mentioned, do be sure to measure your oven's internal size; in my small domestic oven, I can just fit two of these baguette trays onto one shelf of the oven, which leaves the trays virtually touching both the sides and back/front of the oven.